Seems like a surprisingly even member ratio of hype-to-doompost here so far, with two seemingly hyped, two not really getting much, and two getting clowned. At least from what I've seen so far, Maria is giving me Rosemi vibes, in that she doesn't seem to have much on first glance, but might be way more interesting once you actually look into her. Scarle definitely gives off those warm and friendly Nina-like vibes, but it does feel like they could potentially do something great collab-wise. Aster and Ren haven't really done much yet, so I can't get a (very retarded, bear in mind) read on them. Kyo seems like a bit of a dumbass/gremlin, but he's definitely giving off an energetic sort of vibe; most of his doomposting seems roommate-related, and last time that happened Nina turned out great in the long run. Aia's the one I'm concerned about the most so far; she's been giving off a strange blend between Uki and Finana + some positive vibe so far, so she's probably got just as much chance to be entertaining as she has to be utterly fucking unbearable.
Bear in mind that none of this really means anything, and even their debuts won't really mean anything personality-wise in the long run. Said it a dozen times and I'll probably say it a dozen more, but a Vtuber debuting and the same Vtuber who's settled in a month later can be completely different people.